Telemeter.



C. VON HOPE.

TELEMHTRR.

APPLICATION FILED AULLUG. 1909A Patented J uly 8 Vdoes not atl'eet the aetual size ot the objeetinta rarasn PATENT OFFICE.

CHRISTIAN VON HOFE, OF WILMERSDORF, NAR BERLIN, GERMANY, ASSIGNOR TO THE FIR/M OFKOPTISGHE ANSTALT C. NEAR BERLIN, GERMANY.

I. GOERZ AKTIENGES1`LLSCHAFT, OF FRIEDENAU,

TELEMETER.

Specification of Letters Patent.

.Application filed August 26. 1909.

Patented July 8,1913. sria1N0.514.723. i

To (1U whom fili may (fon/fern Ylie it known that l. ("/ums'rmx \'o\' llora. a citizen ot the (iernmn limpire, and resident of lVilmersdol-t, near lerlin. tlermanv, doctor of philosophy, have invented eertain new and useful lmprovenuuts in l`elenieters, of whieh the 'Following is a speeitieation.

My invention relates to telemeters whieh are provided with deviees 't'or predueing two Sets of images ot" objet-ts aimed at in the field of view in sueh relation to eaeh other that the one set appeals-above and the other set below a horizontal boundary line or line of division; the training ot' the instrmnent on a special objeet'. being etl'eeted by bringing the two images on opposite sides ot the line of division into a preseribed relation with each other. ln the various embodi ments of instruments ol this kind the images on opposite sides o t' the boundary line are either alike but one inverted upon the other 'such telemeters being ealled inversion telemeters or two eomplenientary images are `united by the adjustment., this being true t'or so Called eoiiieidenee telemeters.

in order to secure. eonvenieney and aeeuraey of adjustment the boundary line is in aecorclanee with this invention so positioned that it traverses the'field of view but divides the same into two seetions ot unequal sizes. If the line is not exeessively removed from the center the reduetion of its length is only very small, whereas the comparatively slightJ displacement adds eonsiderably to the area of the section ot field on one side ot' the line. This non'synnnetrieal arrangement is of advantage both in inversion telemeters and in coincidence telemeters.. ln the ease ot" the. former the objective field ot' vieu; is in etl'eet enlarged, the images at both sides o't' the line being the same. lin the ease of eoincidenee instruments the nnsyumietrieal arrangement tive field ot' View, different objects being shown at opposite sides ot the line. Neveu theless, the enlargement ot one section ot' the field places a larger Field at the operator-"s disposal, sinee the complemeutary images oulv make a composite image when the instrunient' is `direetly trained thereon; on the right. and left of these partieular objects the part-imageii above and below the line do not make a composite image.

The invention is illustrated in Figures l and et of the annexed drawing, Fig. 'l being a diagram showimY the nou-ivmilietriell lrzr f rangement ot the lmundary line in the, image-tield of an inversion telemeter. Figs. and 3 are diagrams illustrating pr'e'vious arrangenants in inversion instruments old in the art. Fig. 4 a diagram of the imagetield ot' a eoineidenee instrument witli nonsymmetrieal boundary line. Figs. 5 and (i show two eentral seetions through an inversion telemeter aeeording to the invention, the sections being taken at right angles to each other.

Like ret'erenee numerals denote like or equivalent parts in all the figures.

Referring to Fig. l` l represents the boundary line, Q the larger tield-seetion, andv 3 the smaller section. ln the smaller seetiou only a portion oi' the objeet. seen in the larger Seetion is visible, but sutlieient for the purpose ot' adjusting the instrument by bringing the steeples into line at 4. 'lhe large seetion 2 gives a convenient range of view.

ln Fig. Q, illustrating a previously known arrangement, it will be seen that the range of landseape visible is considerably redueed, without any raanpensating :ulvantage with regard to 'faeility of adjustment.

ln ltig. 3, illustrating another known arl rangement, the boundary line (loes not traverse the field but ineloses a small eentral section of the field. The increased size of the section Q `is here ot no advantage, the field being non-eontinuous. Adjustment. is, moreover, reiulered more or less ditlieult, more particularly in the. ease of moving objects, owing to the restrieted length of the boundary linel 1.

In the arrangement shown in Fig. 4:, the instrument, a eoineidenee telemeter, is adjusted ,to bring the tlagstad in linel with the steeple atv al. ln this ease again the advantage ot the inereased size ot 2 is obvious, while there is no dragvhaek by reason of the reduced size of 3.

Figs. 5 and t3 show diagrammatically an embodiment ot'v an inversion telemeter aceording to the invention. ln this embodiment ot a. t'elemeter there are arranged at the end points ot a base, prisms 5 and (t whieh retleet the rays entering them toward the objeetives 7, 8 from whieh they pass to the innige-uniting body t), whieh in the example shown consists of two crossed prisms lt) and l1, the former oi' which being pro- 'ided with a roof odge. The ocular of`the instrument is marked l2;y 13 isav Wedge shaped adjustable compensating device to secure coincidence of the images, le a lscale onA which the distance of objectsis read the images of which 'are brought to coincidence by the compensating device and l5 a pointer connected to the compensating device and movable on scale 14. The contacting planes of the prisms 10, ll` form the horizontal boundary line in the eld of View of the instrument. This horizontal boundary line A'traverses the image field in the Whole of its width and divides it into two sections of unequal size as shown in Flg. 1, Where in the lower. section an upright partial image and in the upper section an inverted partial im 'traversesithe image field in the Whole of the Width and divides same into two sections of unequal size, said telemeter provided with optical means adapted to produce two sets of images of distant objects, one set in each sec tion of the image'iield, the twoV sets of im ages contacting with each other with their upper and lower extremities respectively in said horizontal boundary line. f l

2. An inversion telemeter showing a boundary line in the image-field, traversing same for its entire Width, and dividing it into two sections of'unequal size.V

In testimony Whcreof'l have signed this 'I f specification in the presence of two' subscribing Witnesses.

ciiRis'riAr-f vos Hom.

Witnesses: i FERDINAND Roetwnnomey,

BRUN() Gesca. 

